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import { fetchCache } from './fetch-cache'
import { getRequestCacheKey } from './get-request-cache-key'
import { handleOptions } from './handle-options'
import { fetchRequest } from './fetch-request'
import { resolveRequest } from './resolve-request'
import { globalResHeaders } from './global-res-headers'
addEventListener('fetch', (event) => {
event.respondWith(handleFetchEvent(event))
})
/**
* @param {*} event
*/
async function handleFetchEvent(event) {
const gatewayStartTime = Date.now()
let gatewayTimespan
let res
function recordTimespans() {
const now = Date.now()
gatewayTimespan = now - gatewayStartTime
}
try {
const { request } = event
const { method } = request
if (method === 'OPTIONS') {
return handleOptions(request)
}
const url = new URL(request.url)
if (url.search.length < 0 || url.pathname === '/' || url.pathname === '') {
return new Response(null, {
status: 400,
statusText: 'bad request'
})
}
const { originReq } = await resolveRequest(event, request)
try {
const cacheKey = await getRequestCacheKey(originReq)
const originRes = await fetchCache({
event,
cacheKey,
fetch: () => fetchRequest(event, { originReq })
})
res = new Response(originRes.body, originRes)
recordTimespans()
res.headers.set('x-proxy-response-time', `${gatewayTimespan}ms`)
return res
} catch (err) {
console.error(err)
recordTimespans()
res = new Response(
JSON.stringify({
error: err.message,
type: err.type,
code: err.code
}),
{ status: 500, headers: globalResHeaders }
)
return res
}
} catch (err) {
console.error(err)
if (err.response) {
// TODO: make sure this response also has CORS globalResHeaders
return err.response
} else {
return new Response(
JSON.stringify({
error: err.message,
type: err.type,
code: err.code
}),
{
status: 500,
headers: globalResHeaders
}
)
}
}
}
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